Sub-synchronous and super-synchronous harmonic parameter processing method based on PMU implementation

Abstract

The invention discloses a sub-synchronous and super-synchronous harmonic parameter processing method based on PMU implementation. Current signals containing sub-synchronous and super-synchronous harmonic parameters in A / D acquisition are resampled, can be used for analyzing sub-synchronous harmonic parameters and can be also used for analyzing super-synchronous harmonic parameters, a frequency spectrum of an FFT is corrected by using a Grandke frequency spectrum correction method, a picket fence effect and a frequency spectrum leakage phenomenon in frequency spectrum analysis of the FFT are overcome, the identification precision of oscillating component parameters is greatly improved, the software and hardware expenditures on a WAMS master station side are reduced to some degree, reliable raw data and data support are provided for functions such as power grid wide-area monitoring, automatic substation measurement and control, stability control and self-adaptive relay protection of a whole system, and the sub-synchronous and super-synchronous harmonic parameter processing method has a good application prospect.

Description

technical field [0001] The invention relates to the technical field of power system stability and control, in particular to a method for processing sub-synchronization and super-synchronization harmonic parameters based on a PMU. Background technique [0002] In recent years, with the continuous expansion of the power grid and the integration of new energy such as large-scale wind power into the grid, the frequency of subsynchronous oscillation of the power grid has been increasing. Finding and taking measures to suppress the oscillation in the power grid system in time has become one of the key issues to be solved urgently to ensure the safe and stable operation of the power system. With the increase in the frequency of oscillation, the provincial dispatch center of the network put forward the need to strengthen the global early warning of low-frequency oscillation and sub-synchronized oscillation, and carried out the correlation of online monitoring and analysis of oscilla...

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the problems of long identification time, low identification accuracy, complex algorithm implementation, and inability to analyze super-synchronous harmonic parameters in the existing WAMS master station for on-line monitoring and analysis of oscillation.

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